Preparation of Biodiesel Raw oil is filtered and heated to 1050C temperature to remove water content. Methanol of 120ml and 2ml of H2SO4 per liter of oil are added and heated with stirring at 600C in a closed conical flask. The mixture is allowed to settle in a decanter, and then glycerin is separated from methyl ester. Sodium Methoxide is prepared by mixing 200ml of methanol (20% by vol.) and 6.5 grams of NaOH per liter of oil. This solution is added to the oil, stirred continuously at 600C in a conical flask till the completion of reaction as shown in figure 6. This mixture is allowed to settle in decanter and glycerin is separated from methyl ester (Fig. 4). The collected Sterculia foetida oil methyl ester as shown in figure 5 is bubble washed with water to remove soaps and heated to evaporate water from biodiesel [8, 9].